KernelCare does not actually "switch" to the newly installed (by yum update) kernel - it is not possible without reboot.
What it does is binary patching the running one so that vulnerable procedures are replaced by patched ones in memory.
That's the reason your system still reports to be running an old kernel when you issue 'uname -r'
At the same time, KernelCare does its patching so that you can see that 'Kernel is safe' in kcarectl output.

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